某促淤圈围工程的地基基本上为松散的粉砂性土或软弱黏性土，强度较低，抗冲刷能力弱，当进行围堤及分隔堤施工时，地基土的应力状态和滩面的水沙条件改变，使地基产生变形，水流冲於发生变化，影响工程安全稳定。为此，在工程施工期间利用GPS配合测深仪对水下地形进行动态监测，通过GPS －RTK配合ADCP （声学多普勒流速剖面仪）对龙口流速、流向等进行动态监测，采用水准仪和全站仪对围堤及分隔堤堤身沉降、位移进行动态监测，并对监测数据进行分析，及时掌握沿围堤及分隔堤两侧滩面的冲於变化、龙口水文条件、围堤和分隔堤的堤身沉降及位移等情况，为工程施工的动态管理提供依据，从而提高工程质量、保证工程进度、降低成本。%The ground foundation of a deposition promotion and enclosure engineering is essentially constructed by loose and sandy soil or weak cohesive soil which has the disadvantage of low intensity and weak anti -scouring ability . When causeway and separation dike are under construction , the foundation soil stress state and the conditions of water and sediment will change , which will easily cause the subsidence of ground foundation and the changes of water scour-silt , and result in project instability . Therefore , during the project construction , make use of GPS and detector to implement dynamic monitoring of the underwater topography , through the cooperation of GPS-RTK and ADCP , the dynamic monitoring of flow speed and direction is realized . Adopt water level and total station to monitor the subsidence and displacement of causeway and separation dike dynamically , and analyze the monitoring data to master the two side beach surface change of the causeway and separation dike , longkou hydrological conditions , the subsidence and displacement of causeway and separation dike and so on in time , which will provide basis for dynamic project construction management , so as to improve the project quality , ensure the progress and reduce the cost .
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